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Monday, May 1, 2023 - 12:31

FISS / DDE Dark Days

No FISS/DDE Access on 5/5-5/8 (Part B) and 5/19-5/22 (Part A) !!! Read Below!!!

The Centers for Medicare & Medicaid Services will be migrating its data center in May 2023 . As a result, all Medicare Administrative Contractors (MACs), will be observing a series of dark days to accommodate the anticipated duration of this activity and to ensure the completion of weekly/monthly/quarterly processing and the migration of the data center.

These dark days will limit access to information provided by the interactive voice response (IVR) systems, the FISS/DDE systems and Medicare self-service portals. Providers may experience limited or no access to claim status, eligibility, reopening/appeal status and financial claim information.

Dark Days

Medicare Part B
•    The weekend of 5/5/2023 to 5/8/2023, starting on Friday evening, 5/5/2023, Part B (MCS) production cut-over
•    Monday, 5/8/2023 - MAC dark day to support the completion of the migration to new data center.
Medicare Part A
•    The weekend of 5/19/2023 to 5/21/2023, starting on Friday evening, 5/19/2023, Part A (FISS) production cut-over
•    Monday, 5/22/2023 – MAC dark day to support the completion of the migration to new data center.


There is a chance that your login for FISS/DDE may not work after the dark day. If this happens to your ID you will need to contact your MAC's EDI helpdesk for FISS/DDE and request a temporary password for your RACF ID and login with that on the FISS/DDE system and reset your password.

Wednesday, January 25, 2023 - 10:05


All Certificates of Medical Necessity (CMNs) and Durable Medical Equipment (DME) Information Forms (DIFs) have been discontinued by CMS effective for dates of service January 1, 2023 and after.

If CMNs or DIFs, including those for oxygen, are included on electronic claims and the from date of service is on or after January 1, 2023, the claims will be rejected by CEDI. Claims with dates of service prior to January 1, 2023 should still include CMN and DIF information in accordance with DME MAC processing and policy guidelines.